Answer
(a) Alkali metals: B
(b) Element with outer configuration of $d^{7}s^{2}$: H
(c) lanthanides: A
(d) p-block representative elements: C, F. I
(e) elements with partially filled f-subshells: A, D
(f) halogens: I
(g) s-block representative elements: B, J
(h) actinides: D
(i) d-transition elements: E, H, K
(j) noble gases: G
(k) alkaline earth elements: J
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